CVl 



FAUNA HAWAIIENSIS 



described is uncertain, since some of them are variable and the species are no doubt 

 very difficult to determine. It is impossible to correlate the sexes, unless a species has 

 been bred. Most of the known species are found in the mountain forests, but some 

 have occurred on the lowlands and it is possible that some of these are not endemic. 

 Some are egg-parasites of various orders of insects, e.g. E. axestopsi^) bred from eggs 

 of the Locustid Brachynietopa, and E. rhyncogoni from those of the Otiorhynchine 

 weevil, Rhyncogonus. Others attack larvae of various Coleoptera, or of Neuroptera of 

 the Hemerobiid family {Ano7)!aloch)ysa). Some are frequent parasites of several of the 

 larger bees included in the genus Nesoprosopis, and also of certain Odyneriis, while 

 some are parasitic on Diptera and others of Lepidopterous larvae, both case-bearing 

 and others. The genus Solindenia, described as peculiar to the islands, is a common 

 insect, and will almost certainly be found elsewhere. It is parasitic in the egg capsules 

 of cockroaches of the genus Phyllodroniia and is found to attack foreign species, as well 

 as the native P. obtusata. The single Aiiastahts is quite certainly an introduction, and 

 thouo-h now widely spread, is a common garden insect in Honolulu, where it parasitizes 

 the eggs of the introduced Locustid Eliviaea appendiculata. The habits of the one 

 described Eiipelniinus are not known. 



Of the Encyrtinae, Encyrtus fusciis, one of the most abundant insects in parts of 

 Australia, as we have found it, is no less common in the islands, being introduced and 

 parasitic on various species of scale-insects of the genus Lecanium, also introduced. 



The members of the tribe Mirini include some common parasites of foreign scale- 

 insects, Microterys flavus e.g., and Blepyrus insularis { = B. niarsdeni How.) which are 

 clearly introduced. .Others, however, are likely to prove endemic, e.g. the parasites 

 of the Dryinid leaf-hopper parasite, Pseudogonatopus, and a species, which infests the 

 larvae of various kinds of wasps of the genus Odynerus. Aphidencyrtiis on Aphidae 

 is of course introduced, as also is a species, for which the late Dr Ashmead proposed 

 to characterize a new genus, Aniicroterys, common in gardens in Honolulu, where it 

 parasitizes an abundant scale-insect of Cynodon dactylon. 



The habits of several other species are at present unknown. 



The tribe Ectromini includes six species of the genus A»agy7'Hs{}) described by 

 myself, but whether these are all really good species is doubtful. Their habits are 

 not known, and until these are ascertained, I feel doubts as to the endemicity of the 

 species. They occur near the coast, as well as in the mountains. Should they prove 

 to be parasites of foreign Coccidae, we may be sure that they are themselves foreign 

 and either have been introduced accidentally with their hosts, or in some cases, possibly, 

 for economic reasons by Koebele. He, as I know positively, attempted to introduce 

 Anagyriis from China and Japan. 



Pteromalidae. — The great complex of genera here included, is almost unrepre- 

 sented by endemic sjoecies, for of the very few known to exist in the islands, only one, 



